An adjustable nozzle for an oral irrigator

Abstract

The present disclosure belongs to the technical field of oral cleaning devices, and particularly relates to a waterpik adjustable nozzle, which comprises a shell located at the outermost side of the adjustable nozzle, an adjusting valve, a rotating wheel and a first channel formed between the adjusting valve and the shell. The adjusting valve is movably arranged relative to the shell, and one end of the adjusting valve is conical. The rotating wheel is sleeved outside the adjusting valve, a second channel is formed between the rotating wheel and the shell, and a third channel is formed between the rotating wheel and the adjusting valve. The relative position of the adjusting valve and the shell is adjusted to open or block the connection of the first channel and the third channel, so as to adjust the water flow pattern sprayed by the adjustable nozzle. The water flow entering the nozzle is sprayed from the first hole, and the sprayed water flow at least includes one of the spraying water flow extending along the axial extension direction of the adjusting valve in a straight line shape and the spraying water flow extending in a contraction direction along one end of the adjusting valve, so as to be suitable for different oral conditions of users.

Description

Technical Field

[0001] This disclosure belongs to the field of oral hygiene device technology, and more specifically relates to an adjustable nozzle for a water flosser. Background Technology

[0002] In existing technologies, water flosser nozzles include standard nozzles, orthodontic nozzles, and periodontal pocket nozzles. Users need to select different types of nozzles based on their actual oral condition: standard nozzles are suitable for people with normal oral health, providing regular rinsing with a linear water stream that has strong impact to effectively clean food debris between teeth; orthodontic (braces) nozzles are for people undergoing orthodontic treatment or wearing braces, with bristles for easy cleaning of braces after treatment; periodontal pocket nozzles are suitable for people with periodontitis or gingivitis, using a soft rubber nozzle head to reduce the impact of the water stream and make it gentler, allowing the water to penetrate deep into the pockets and soothe inflammation. As described above, in practice, manufacturers need to provide users with multiple types of nozzles or nozzle cases specifically for various types of nozzles. Users often only use one type of nozzle, while others are rarely used and easily lost. Furthermore, when using two or more nozzles, it is necessary to disassemble the previously installed nozzle and install another, making the operation less convenient. Summary of the Invention

[0003] This disclosure is made based on the aforementioned needs of the prior art. The technical problem to be solved by this disclosure is to provide an adjustable nozzle for a water flosser to be tailored to different oral conditions of users.

[0004] To address the aforementioned problems, the technical solutions provided in this disclosure include:

[0005] An adjustable nozzle for a dental flosser is provided, comprising: a housing located on the outermost side of the adjustable nozzle; a regulating valve disposed within the housing, forming a first channel between the regulating valve and the housing, the regulating valve being movable relative to the housing, one end of the regulating valve being tapered; a rotating wheel disposed within the housing and sleeved outside the regulating valve, forming a second channel between the rotating wheel and the housing, and a third channel between the rotating wheel and the regulating valve; and an end cap adapted to and covering the rotating wheel, the end cap including a first hole, one end of the regulating valve being able to at least partially extend into the first hole; by adjusting the relative position of the regulating valve and the housing to open or block the connection between the first and third channels, the water flow pattern ejected from the adjustable nozzle is adjusted, the water flow entering the nozzle is ejected from the first hole, and the ejected water flow includes at least one of a jet water flow extending in a straight line along the axial extension direction of the regulating valve and a jet water flow extending along one end of the regulating valve in a contraction direction.

[0006] The above-mentioned arrangement forms multiple channels for water flow between the outer shell, regulating valve, impeller, and end cap. By changing the relative positions of these channels, the connectivity of each channel is altered, thereby changing the shape and force of the water jet. This allows a single nozzle to achieve multiple different forms of water jetting, enabling users to choose the appropriate mode based on their oral cavity conditions without changing the nozzle. The operation is simple and provides a good user experience.

[0007] Preferably, adjusting the relative position of the regulating valve and the housing to open or block the connection between the first and third channels includes: the regulating valve having a boss that is adapted to the rotating wheel; the rear end of the regulating valve having at least a partial thread, and the inner wall of the housing having a corresponding thread adapted to the rear end of the regulating valve, so that the regulating valve can move between a first position and a second position; when the regulating valve is in the first position, the boss abuts against the rotating wheel, and the first and third channels are relatively closed to each other; when the regulating valve is in the second position, there is a gap between the boss and the rotating wheel, and the first and third channels are connected.

[0008] This configuration allows for the control of the opening and closing of the first and third channels by adjusting the relative position of the upper boss and the rotor of the regulating valve, thereby changing the flow direction of the water and controlling whether a straight stream of water can be ejected from the first hole.

[0009] Preferably, the adjusting member includes a first part and a second part arranged front to back along its extension direction, the longitudinal section of the first part being larger than the longitudinal section of the second part, and the boss being formed at the connection between the first part and the second part.

[0010] The protrusions formed by the first and second parts ensure that the water flow does not need to consume extra energy to cross the protrusions. The energy saved allows the water flow ejected from the nozzle to have greater kinetic energy and less water pressure loss.

[0011] Preferably, the rotating wheel is provided with a second hole, which is obliquely disposed at one end of the rotating wheel near the first hole. The oblique direction of the second hole includes a component extending along the center of the regulating valve and a component extending from back to front along the regulating valve; the second hole forms a fourth channel.

[0012] Setting the second hole in an inclined shape can change the direction of water flow, so that the water flow ejected from the nozzle forms a certain angle with the axis of the regulating valve; at the same time, it can also reduce the impact of water flow on the rotational power of the impeller when it flows through the fourth channel, so as to avoid consuming the kinetic energy of the water flow in the second channel.

[0013] Preferably, the end cap includes a first state and a second state. When the end cap is in the first state, the end cap is in contact with the rotating wheel, and static friction is generated between them, so the rotating wheel remains stationary. When the end cap is in the second state, the rotating wheel can rotate.

[0014] The above settings allow the impeller to have two different states, and the state of the impeller controls whether the water jet sprayed through the first hole can rotate. When the impeller is stationary, the water jet at the first hole is either straight or scattering. When the water jet is scattering, the water jet does not rotate. However, when the impeller rotates, the water jet at the first hole can rotate and spray a scattering water jet.

[0015] Preferably, the wheel includes a column and a plurality of first protrusions, the plurality of first protrusions extending in the direction of rotation around the column, and two adjacent first protrusions, the column and the outer shell together form a second channel.

[0016] Setting the column as a hollow structure allows the impeller to rotate around the regulating valve, providing a structural basis for the rotation of the regulating valve. The first protrusion extends along the rotation direction of the column, allowing the water flow that rushes between the two first protrusions to generate a force that drives the impeller to rotate. Without the action of other external forces, when the water flows along the second channel, it can drive the impeller to rotate.

[0017] Preferably, when the regulating valve is in the first position and the end cap is in the first state, the first hole sprays a water flow in a scattering pattern.

[0018] The above settings allow the nozzle to spray a low-pressure water stream in a diffused pattern, preventing the water stream from rotating. This configuration is suitable for people wearing braces or aligners. The water pressure from the first nozzle is low, and the water particles are small, making it easy to clean the braces after orthodontic treatment.

[0019] Preferably, when the regulating valve is in the second position and the end cap is in the first state, the first hole sprays a straight stream of water.

[0020] The above settings ensure that the water stream from the nozzle exits in a straight line from the first hole. This is the normal rinsing function, suitable for people with normal oral health. The straight, impactful water stream effectively cleans bacteria and debris between teeth or between teeth and gums to maintain oral hygiene.

[0021] Preferably, when the regulating valve is in the first position and the end cap is in the second state, the first hole sprays a swirling water flow in a scattering pattern.

[0022] The above configuration causes the water flow from the first hole of the end cap to be sprayed out in a scattering, rotating manner with a certain impact force. This mode is suitable for people with periodontitis or gingivitis. The scattering, rotating water flow has a relatively weak impact force and the overall water flow is gentle. In this mode, the water flow can penetrate into the cleaning pocket, thereby effectively relieving inflammation.

[0023] Preferably, when the regulating valve is in the second position and the end cap is in the second state, the first hole sprays a scattering rotating water flow and a straight water flow.

[0024] The above configuration allows water to be ejected from the first hole of the end cap in a straight line, extending substantially axially. Additionally, the first hole also ejects a swirling, diffused stream of water extending along the tapered direction of the first end. The straight-line jet has a certain impact force, while the diffused, swirling jet is gentler and has less force. This configuration is suitable for individuals with periodontitis or gingivitis. The straight-line jet from the first hole has limited impact, while the diffused, swirling jet has a weaker impact, resulting in a gentler overall flow. This water flow can penetrate into the cleaning pocket, effectively relieving inflammation.

[0025] Compared with the prior art, the present disclosure allows users to adjust the type of water flow from the nozzle by adjusting the adjustment part and changing the state of the end cap without changing the nozzle. It is convenient to operate and does not require replacement. At the same time, it can ensure that the kinetic energy of the flowing water is not lost too much, thereby maintaining the water pressure at the nozzle to provide users with a good user experience. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a cross-sectional structural diagram of a nozzle in one state according to an embodiment of the present disclosure;

[0028] Figure 2 This is a cross-sectional structural diagram of another state of the nozzle in an embodiment of this disclosure;

[0029] Figure 3 This is a cross-sectional view of another state of the nozzle in an embodiment of this disclosure;

[0030] Figure 4 This is a cross-sectional view of the nozzle in another state according to an embodiment of this disclosure;

[0031] Figure 5 This is a three-dimensional structural diagram of the wheel at one angle in an embodiment of this disclosure;

[0032] Figure 6 This is a three-dimensional structural diagram of the wheel from another angle in an embodiment of this disclosure;

[0033] Figure 7 This is a three-dimensional structural diagram of the regulating valve in an embodiment of this disclosure;

[0034] Figure 8 This is a three-dimensional structural diagram of the end cap in an embodiment of this disclosure. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of the embodiments of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0037] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.

[0038] To facilitate understanding of the embodiments of this application, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application.

[0039] This embodiment provides an adjustable nozzle for a dental flosser, such as... Figures 1-8 As shown.

[0040] like Figures 1-4 As shown, the adjustable nozzle of the oral irrigator includes a housing 1, an adjusting valve 2, a rotating wheel 3, and an end cap 4.

[0041] The outer casing 1, located on the outermost side of the nozzle, protects the internal components and provides support strength.

[0042] Control valve 2, such as Figure 7 As shown, a first channel 7 is formed between the regulating valve 2 and the housing 1, both disposed within the housing 1. The rear end of the regulating valve 2 is at least partially threaded, and a corresponding thread on the inner wall of the housing 1 is provided to match the rear end of the regulating valve 2, allowing the regulating valve 2 to move between a first position and a second position. Specifically, by rotating the regulating valve 2, the thread at the rear end of the regulating valve 2 rotates relative to the thread on the inner wall of the housing 1, enabling the regulating valve 2 to move forward or backward relative to the housing 1.

[0043] Furthermore, the adjusting member includes a first portion 203 and a second portion 204 arranged front and rear along its extension direction. The longitudinal section of the first portion 203 is larger than the longitudinal section of the second portion 204, and a boss 206 is formed at the connection between the first portion 203 and the second portion 204. Since the water flow direction in the first channel 7 is from the first portion 203 to the second portion 204, if a protrusion is provided as a boss 206, the water flow in the first channel 7 needs to consume a certain amount of kinetic energy to pass over the boss 206. However, by providing the boss 206 formed at the junction of the first portion 203 and the second portion 204, the water flow does not need to consume extra energy to pass over the boss 206. The energy saved allows the water flow ejected from the nozzle to have greater kinetic energy and less water pressure loss.

[0044] In addition, the regulating valve 2 also includes a third part 205. The first end 207 of the regulating valve 2 is the end away from the regulating part. The first end 207 is disposed on the third part 205. The first end 207 is generally conical and contracts in the direction away from the regulating part.

[0045] The third portion 205 at least partially protrudes from the second portion 204. Specifically, the third portion 205 is provided with a plurality of elongated second protrusions 208. The length extension direction of the second protrusions 208 is the same as the extension direction of the regulating valve 2, and the spacing between adjacent second protrusions 208 is the same. A groove is formed between two second protrusions 208, and the bottom of the groove is substantially on the same straight line as the outer surface of the regulating valve 2 of the second portion 204. The groove between two second protrusions 208 can effectively guide the flow. In addition, when the water flows from the location of the second portion 204 to the location of the third portion 205, no excessive energy is consumed, effectively reducing the water pressure loss of the water flow sprayed from the nozzle.

[0046] Furthermore, the groove formed between the two second protrusions 208 extends at least partially to the first end 207, i.e., the first end 207 has a groove at a position away from the end, also to reduce wear and effectively guide flow.

[0047] Rotating wheel 3, as Figure 5 and Figure 6 As shown, the wheel 3 is disposed inside the housing 1 and sleeved outside the regulating valve 2. A second channel 8 is formed between the wheel 3 and the housing 1, and a third channel 5 is formed between the wheel 3 and the regulating valve 2.

[0048] Specifically, the impeller 3 includes a column 301 and multiple first protrusions 302. The column 301 is hollow and has a central channel inside. The regulating valve 2 passes through the central channel, forming a third channel 5 between the outer side of the regulating valve 2 and the inner wall of the column 301. The multiple first protrusions 302 extend in the direction of rotation around the column 301, and two adjacent first protrusions 302, the outer wall of the column 301, and the inner wall of the outer shell 1 together form a second channel 8. Both the second channel 8 and the third channel 5 provide flow space for water. The hollow structure of the column 301 allows the impeller 3 to rotate around the regulating valve 2, providing a structural basis for the rotation of the regulating valve 2. The extension of the first protrusions 302 in the direction of rotation of the column 301 allows the water flowing between the two first protrusions 302 to generate a force that drives the impeller 3 to rotate. Without other external forces, when the water flows along the second channel 8, it can drive the impeller 3 to rotate.

[0049] Furthermore, the impeller 3 is also provided with a second hole 303, which is inclinedly disposed at the end of the impeller 3 near the first hole 401. The inclination direction of the second hole 303 includes a component extending along the center of the regulating valve 2 and a component extending from back to front along the regulating valve 2; the second hole 303 forms a fourth channel 6. The first channel 7, the fourth channel 6 and the second channel 8 are always connected. Setting the second hole 303 in an inclined shape can change the flow direction of the water flow, so that the nozzle sprays water at a certain angle to the axis of the regulating valve 2; at the same time, it can also reduce the impact of the water flow on the rotational power of the impeller 3 when the water flows through the fourth channel 6, so as to avoid consuming the kinetic energy of the water in the second channel 8.

[0050] The rotating wheel 3 is adapted to the boss 206. When the thread at the rear end of the regulating valve 2 is fully engaged with the thread on the outer shell 1, that is, when the regulating valve 2 is adjusted to the first position, the boss 206 and the rotating wheel 3 abut against each other, and there is almost no gap between the boss 206 and the rotating wheel 3. The water flow in the first channel 7 cannot enter the third channel 5 formed by the regulating valve 2 and the rotating wheel 3. In other words, at this time, the first channel 7 and the third channel 5 are relatively closed to each other. When the thread at the rear end of the regulating valve 2 is partially engaged with the thread on the outer shell 1, that is, when the regulating valve 2 is adjusted to the second position, there is a gap between the boss 206 and the rotating wheel 3, and the first channel 7 and the third channel 5 are connected. The water flow in the first channel 7 can flow into the third channel 5.

[0051] End cap 4, such as Figure 8 As shown, the end cap 4, adapted to and covering the rotor 3, includes a first hole 401, into which one end of the regulating valve 2 can at least partially extend. Based on the cooperation between the end cap 4 and the rotor 3, the end cap 4 has a first state and a second state. When the end cap 4 is in the first state, it is in contact with the rotor 3, and static friction is generated between them. The rotor 3 remains stationary when water flows through it. When the end cap 4 is in the second state, the rotor 3 can rotate when water flows through it. Based on the above discussion, the state of the end cap 4 will affect the power of the water jet. When the end cap 4 changes from the first state to the second state, the water pressure of the water jet through the fourth space jet increases from weak to strong.

[0052] In summary, by adjusting the relative position of the regulating valve 2 and the outer casing 1 to open or block the connection between the first channel 7 and the third channel 5, the water flow pattern ejected from the adjustable nozzle can be adjusted. By adjusting the tightness of the rotating wheel 3 and the end cap 4, the water flow at the spray point of the adjustable nozzle can be adjusted to see if it can rotate.

[0053] The water flow entering the nozzle is ejected from the first hole 401. The ejected water flow includes at least one of the following: a jet of water extending in a straight line along the axial direction of the regulating valve 2, and a jet of water extending along one end of the regulating valve 2 in a contraction direction. Specifically, the adjustable nozzle of the oral irrigator in this embodiment has the following modes:

[0054] When the regulating valve 2 is in the first position and the end cap 4 is in the first state: (e.g.) Figure 1As shown, the boss 206 abuts against the rotating wheel 3, with no gap between the boss 206 and the rotating wheel 3, so water flow is almost nonexistent. At this time, the first channel 7, the second channel 8, and the fourth channel 6 are connected, and the rotating wheel 3 and the end cap 4 are relatively stationary. The water flow in the first channel 7 flows along the second channel 8 on the stationary rotating wheel 3. Since the rotating wheel 3 remains stationary, the water flow will lose a significant amount of kinetic energy as it moves along it, flowing into the fourth channel 6 through the second channel 8. The water flow entering the fourth channel 6 flows and sprays along the conical contraction direction of the first end 207. Although the first protrusion 302 extends along the rotation direction of the column 301, the stationary rotating wheel 3 causes the nozzle to spray a low-pressure water flow in a scattering pattern, and the sprayed water flow cannot rotate at this time. This state is suitable for people wearing braces or aligners. The water flow sprayed from the first hole 401 has low water pressure and small water particles, making it convenient to clean the braces worn after orthodontic treatment.

[0055] When the regulating valve 2 is in the first position and the end cap 4 is in the second state: (e.g.) Figure 2 As shown, the first channel 7 and the third channel 5 are not connected. Water flows along the first channel 7, the second channel 8, and the fourth channel 6. The impeller 3 and the end cap 4 can rotate relative to each other. The water flowing from the first channel 7 flows along the second channel 8 on the rotatable impeller 3 and flows into the space between the second protrusions 208 through the fourth channel 6. Since the impeller 3 is rotatable, it rotates under the influence of the water flowing through it. The energy lost by the water flow is less than the energy lost when the impeller 3 is stationary, so the kinetic energy in the water flow is greater than the kinetic energy in the water flow when the impeller 3 is stationary. The water flow in the first hole 401 of the end cap 4 is sprayed out in a scattering, rotating manner and has a certain impact force. This state is suitable for people with periodontitis or gingivitis. The impact force of the scattering, rotating water flow is relatively weak, and the overall water flow is gentle. The water flow in this state can penetrate into the cleaning pocket, thereby effectively relieving inflammation.

[0056] When the regulating valve 2 is in the second position and the end cap 4 is in the first state: (e.g.) Figure 3As shown, there is a gap between the protrusion 206 and the rotating wheel 3. The first channel 7 is connected to the third channel 5, and the first channel 7, the second channel 8, and the fourth channel 6 are also connected. The rotating wheel 3 is relatively stationary with respect to the end cap 4. With the end cap 4 and the rotating wheel 3 relatively stationary, the rotating wheel 3 cannot rotate due to the static friction generated with the end cap 4 and remains stationary. When the water flows from the first channel 7 into the second channel 8 and the fourth channel 6 in sequence, it consumes a large amount of kinetic energy, causing the water flowing out through this flow path to be sprayed under the influence of another flow path. In this other flow path, the water flows out in a straight line from the first channel 7 along the third passage formed between the second protrusions 208 on the adjusting rod. The water in the nozzle sprays out in a straight line from the first hole 401. This state is the normal rinsing function, suitable for people with normal oral health. The sprayed water is straight and has impact force, effectively cleaning bacteria or debris between teeth or between teeth and gums to maintain oral hygiene.

[0057] When the regulating valve 2 is in the second position and the end cap 4 is in the second state: (e.g.) Figure 4 As shown, two flow paths are formed inside the nozzle. One is the flow path formed by the connection of the first channel 7 and the third channel 5, and the other is the flow path formed by the connection of the first channel 7, the second channel 8, and the fourth channel 6. The water flow in the flow path formed by the connection of the first channel 7 and the third channel 5 is ejected in a straight line along the passage formed between the second protrusions 208. When the water flow in the other flow path enters the second channel 8, since the rotor 3 is in a rotatable state, the rotor 3 rotates under the drive of the water flow and enters the passage formed between the second protrusions 208 from the fourth channel 6, and is ejected along the preset angle formed by the first end 207. Thus, a straight water flow that extends substantially in the axial direction is ejected from the first hole 401 of the end cap 4. Since the water flow in the first passage is divided into two paths, the water pressure of the water flow extending in the axial direction is less than the water pressure of the water flow sprayed by the conventional rinsing function. In addition, the first hole 401 of the end cap 4 also sprays a water flow that sprays along the conical extension direction of the first end 207 and is sprayed in a scattering and rotating manner. In addition, the straight-jet water flow has a certain impact force, while the scattering, rotating water flow is gentler and has less impact. This mode is suitable for people with periodontitis or gingivitis. The straight-jet water flow from the first hole 401 has limited impact force, while the scattering, rotating water flow has weak impact force. The overall water flow is gentle, and the water flow in this mode can reach into the cleaning pocket, thereby effectively relieving inflammation.

[0058] Furthermore, a protruding collar is provided between the rotor 3 and the regulating valve 2. When the boss 206 abuts against the rotor 3, the water flow in the first channel 7 impacts and drives the rotor 3 to move slightly forward. At this time, the rotor 3 presses against the collar, and the third channel 5 is more tightly sealed, so that the water flow in the first channel 7 basically flows to the second channel 8. However, when the boss 206 and the rotor 3 do not abut against each other and there is a certain space between them, part of the water flow flows to the third channel 5 and breaks through the collar to flow out of the nozzle.

[0059] Because of the collar, when the regulating valve 2 is in the first position and the end cap 4 is in the first state, the forward and backward output of the first end 207 of the regulating valve 2 is 0-1.5mm, so that the adjustable cone angle of the water jet in a scattering pattern is 0°-30°; in addition, when the regulating valve 2 is in the second position and the end cap 4 is in the second state, the adjustable cone angle of the water jet in a scattering pattern is 0°-35°; while when the regulating valve 2 is in the first position and the end cap 4 is in the second state, the cone angle of the water jet in a scattering pattern is not adjustable.

[0060] The adjustable nozzle of the water flosser provided in this embodiment can provide different spray functions for different oral conditions through a single nozzle, without the need for replacement or disassembly, and there is no risk of loss after replacement or disassembly. Overall, it is simple and quick to operate. Furthermore, it can meet the needs of the general population, people with periodontitis and gingivitis, and people wearing braces or retainers. When the user's oral condition changes, the spray pattern can be adjusted to suit the user's oral condition without replacing the nozzle, offering high cost-effectiveness and convenient operation.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An adjustable nozzle for a dental flosser, characterized in that, include: The outer casing is located on the outermost side of the adjustable nozzle; A regulating valve is disposed inside the housing, forming a first channel between the regulating valve and the housing, the regulating valve and the housing being movable relative to each other, and one end of the regulating valve being tapered; A rotating wheel is disposed inside the housing and sleeved outside the regulating valve. A second channel is formed between the rotating wheel and the housing, and a third channel is formed between the rotating wheel and the regulating valve. An end cap is adapted to and covers the rotating wheel. The end cap includes a first hole, and one end of the regulating valve can at least partially extend into the first hole. The end cap has a first state and a second state. When the end cap is in the first state, the end cap is in contact with the rotating wheel, and static friction is generated between them, keeping the rotating wheel stationary. When the end cap is in the second state, the rotating wheel can rotate. By adjusting the relative position of the regulating valve and the housing to open or block the connection between the first channel and the third channel, the water flow pattern ejected from the adjustable nozzle can be adjusted. The water flow entering the nozzle is ejected from the first hole. The ejected water flow includes at least one of the following: a jet water flow that extends in a straight line along the axial extension direction of the regulating valve and a jet water flow that extends along one end of the regulating valve in the contraction direction. By adjusting the relative position of the regulating valve and the housing, the connection between the first channel and the third channel can be opened or blocked, including: The regulating valve is provided with a boss, which is adapted to the rotating wheel; The rear end of the regulating valve is at least partially provided with threads, and the corresponding position of the inner wall of the housing is provided with threads adapted to the rear end of the regulating valve, so that the regulating valve can move between a first position and a second position. When the regulating valve is in the first position, the boss abuts against the rotating wheel, and the first channel and the third channel are relatively closed to each other; When the regulating valve is in the second position, there is a gap between the boss and the rotating wheel, and the first channel and the third channel are connected.

2. The adjustable nozzle of the oral irrigator according to claim 1, characterized in that, The regulating valve includes a first part and a second part arranged front to back along its extension direction. The longitudinal section of the first part is larger than the longitudinal section of the second part, and the boss is formed at the connection between the first part and the second part.

3. The adjustable nozzle of the oral irrigator according to claim 1, characterized in that, The rotating wheel is provided with a second hole, which is inclined at one end of the rotating wheel near the first hole. The inclination direction of the second hole includes a component extending along the center of the regulating valve and a component extending from back to front along the regulating valve; the second hole forms a fourth channel.

4. The adjustable nozzle of the oral irrigator according to claim 1, characterized in that, The wheel includes a column and a plurality of first protrusions, which extend in the direction of rotation around the column. Two adjacent first protrusions, the column, and the outer shell together form a second channel.

5. The adjustable nozzle of the oral irrigator according to claim 1, characterized in that, When the regulating valve is in the first position and the end cap is in the first state, the first hole sprays a water flow in a scattering pattern.

6. The adjustable nozzle of the oral irrigator according to claim 1, characterized in that, When the regulating valve is in the second position and the end cap is in the first state, the first hole sprays a straight stream of water.

7. The adjustable nozzle of the oral irrigator according to claim 1, characterized in that, When the regulating valve is in the first position and the end cap is in the second state, the first hole sprays a swirling water stream in a scattering pattern.

8. The adjustable nozzle of the oral irrigator according to claim 1, characterized in that, When the regulating valve is in the second position and the end cap is in the second state, the first hole sprays a scattering rotating water flow and a straight water flow.

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